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TheRock/debug-tools/rocgdb/source/gnulib/import/m4/getrandom.m4
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Flatten subprojects into a single base monorepo
2026-09-02 16:34:47 -07:00

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# getrandom.m4 serial 8
dnl Copyright 2020-2022 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl Written by Paul Eggert.
AC_DEFUN([gl_FUNC_GETRANDOM],
[
AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
AC_CHECK_FUNCS_ONCE([getrandom])
if test "$ac_cv_func_getrandom" != yes; then
HAVE_GETRANDOM=0
else
dnl On Solaris 11.4 the return type is 'int', not 'ssize_t'.
AC_CACHE_CHECK([whether getrandom is compatible with its GNU+BSD signature],
[gl_cv_func_getrandom_ok],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[/* Additional includes are needed before <sys/random.h> on uClibc
and Mac OS X. */
#include <sys/types.h>
#include <stdlib.h>
#include <sys/random.h>
ssize_t getrandom (void *, size_t, unsigned int);
]],
[[]])
],
[gl_cv_func_getrandom_ok=yes],
[gl_cv_func_getrandom_ok=no])
])
if test $gl_cv_func_getrandom_ok = no; then
REPLACE_GETRANDOM=1
fi
fi
case "$host_os" in
mingw*)
AC_CHECK_HEADERS([bcrypt.h], [], [],
[[#include <windows.h>
]])
AC_CACHE_CHECK([whether the bcrypt library is guaranteed to be present],
[gl_cv_lib_assume_bcrypt],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <windows.h>]],
[[#if !(_WIN32_WINNT >= _WIN32_WINNT_WIN7)
cannot assume it
#endif
]])
],
[gl_cv_lib_assume_bcrypt=yes],
[gl_cv_lib_assume_bcrypt=no])
])
if test $gl_cv_lib_assume_bcrypt = yes; then
AC_DEFINE([HAVE_LIB_BCRYPT], [1],
[Define to 1 if the bcrypt library is guaranteed to be present.])
LIB_GETRANDOM='-lbcrypt'
else
LIB_GETRANDOM='-ladvapi32'
fi
;;
*)
LIB_GETRANDOM= ;;
esac
AC_SUBST([LIB_GETRANDOM])
])